Sand-papering machine



M. L. BEAL.

S'ANDPAPERING MACHINE. APPLICATION FILED AUG.4,1919.

1,395,468. Patented Nov. 1, 1921.

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M. L. BEAL.

SANDPAPERING MACHINE.

APPLICATION FILED AUG.4. 1919.

- Patented Nov. 1, 1921.

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SAN D-PAPERING MACHINE.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Applicationflled August 4, 1919. Serial No. 815,278.

To all whom it may concern:

Be it known that I, MICHAEL L. BEAL, a citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Sand-Papering Machines, of which the following is a specification.

My object is to make an improved sand papering machine halving a resilient expanding drum, and my invention consists of the novel features herein shown, described and claimed.

Figure 1 is a top plan view of a sand papering machine embodying the principles of my invention, the view being taken looking in the direction indicated by the arrow 1 in Fig. 2.

Fig. 2 is a side elevation looking in the direction indicated by the arrow 2 in Fig. 1.

Fig. 3 is an enlarged fragmentary sectional detail showing the expanding drum construction, the view being taken on a plane parallel with Fig. 1 and on the lines 3-3 of Figs. 2 and 4.

Fig. 4 is a cross section on the line 4-4 of Fig. 3 and looking in the direction indicated by the arrow.

Fig. 5 is a cross section on the line 55 of Fig. 3 and looking in the direction indicated by the arrow.

Fig. 6 is a perspective of the resilient expanding drum with the sand paper applied and the drum removed from the core.

Fig. 7 is a perspective of the core which ex ands the drum shown in Fig. 6.

ig. 8 is a perspective view of a split ring that forms a part of the means utilized for retaining the expanding drum upon the core of the cylinder.

Fig. 9 is a detail end elevation upon an enlarged scale showing the sand paper and backing fitting loosely upon the drum as -when the sand paper and backing is applied 45 to or removed from the drum.

Fig. '10 is a cross section showing the core in the drum and the drum expanded to tighten the backing and sand paper as required to hold the sand paper in place 50 upon the drum, the view being taken on the line 1010 of Fig. 11 and on a plane parallel with Fig. 9.

Fig. 11 is an enlarged sectional detail longitudinally of the axis and showing how 65 the expanding drum fits upon the core to expand the drum and tighten the backing and sand paper, the drum being shown in elevation.

The side bars 1 and 2 are rigidily connected by a rear bar 3 and intermediate bars 4 and 5. The side bar 1 is substantlally half as long as the side bar 2. Posts 6 extend upwardly from the rear ends of the side bars 1 and 2. A handle 7 connects the upper ends of the posts 6, and an electric swltch 8 is mounted upon one of theposts 6 convenient to the handle 7. The electric motor 9 is mounted upon the intermediate bars 4 and 5. A bar 10 is rigidly connected to the forward end ofthe bar 2 by a bracket 11. A bar'12 is connected to the bar 1 by a hlnge 13 and fits against the free end of the bar 10 and is held removably in place by a wing nut 14, so that when the wing nut 14 1s removed the bar 12 will swing outwardly on the hinge 13, and so that when the bar is in place, as in Fig. 1, the bar 12 is parallel with the bar 2 and forms a part of the frame for supporting the sand paper drum 15.

The details of the sand paper drum 15 are as follows:

The core 16 is circular in cross section and slightly tapered longitudinally. The flange 17 is recessed into one end of the core 16. The shaft 18 extends through the ball bearing 19 in the flange 17 and extends loosely through the core 16. A bearing 20 is fixed in the bar 12 and the pintle 21 upon one end of the shaft 18 fits in the bearing 20. Flanges 22 and 23 are secured to the inner and outer faces of the bar 2. The shaft 18 has a screw threaded end 24. screwed through the flanges 22 and 23 and held rigidly in place by a lock nut 25.

A noiseless chain pulley 26 is mounted around the shaft 18, spacing collars 27 are placed between the pulley 26 and the flange 17, and bolts 28 are inserted through the pulley 26, through the collars 27, and through the flange 17 to hold the pulley rigidly in place upon the core 16.

A ring flange 29 fits against the end of the core 16 and extends outwardly beyond the periphery of the core all the way around and screws 30 are inserted through the flange and screwed into the core to hold the flange in place.

The core 16 is preferably of wood built up and turned like a pulley. Grooves 31 are formed longitudinally and radially in the periphery of the core 16 and tongues 32, 33, 34 and 35 are formed of strap iron and inserted into the grooves 31, so that the tongues will project a short distance beyond the eriphery 36 of the core, and the ends 37 0 the tongues 32, 33, 34 and 35 are tapered at the small end of the core and the tongues butt against the. end of the fiange 29 at the large end of the core. The expanding drum 38 fits upon the core thus constructed, and the details of the expandingIdrum 38 are as follows:

eavy sheet metal plates 39, 40, 41 and 42 are arcuate and formed so that each of said plates is substantially a quarter of a circle in cross section or end elevation, and the four plates fitting together form a circle smaller than the drum 38.

An elastic band 43 of sponge rubber fits around the plates 39, 40, 41 and 42. The expanding drum thus constructed may be slipped over the core 16 and the tapered ends 37 of the tongues will enter the spaces 44, 45, 46 and 47 between the plates 39, 40, 41 and 42 and force the plates apart to expand the rubber 43, and when the drum reaches a point near the flange 29 the plates will rest upon the tapered periphery of the core 16, and when the drum is placed fully upon the core and a ainst the flange 29 it will be expanded an firmly seated upon the core.

A split ring 48 is inserted inside of the ends of the plates 39, 40, 41 and 42 around the small end of the core 16 to build up the small end of thecore to the size of its larger end and tighten the expansion drum upon the supporting plates 39, 40, 41 and 42. (See Fig. 8.) Buttons 49, 50, 51 and 52 fit against the end face of the core 16 and are secured in place by screws 53, and the buttons extend outwardly to fit against the ring 48 and press the ring into place when the screws 53 are tightened, and when the screws 53 are loosened the buttons may be turned out of the way so that the ring 48 may be removed.

The sand paper backing 54 comprises a cylinder formed of relatively thin sheet metal, the size of which cylinder is such as to snugly fit the expanding drum 38. The sand paper 55 is formed into a cylinder by gluing the edges of a piece of sand paper together and the sand paper 55 fits upon the backing 54. When the expanding drum 38 is removed from the core, as in Fig. 9, the backing 54 carrying the sand paper 55 fits loosely upon the expanding drum and the plates 39, 40, 41 and 42 are substantially together at their edges. When the expanding drum 38 carrying the backing 54'and sand paper 55 is upon the core, as in Fig. 10, the plates 39, 40, 41 and 42 are spread apart and the expanding drum expanded by stretching the rubber, and the backing 54 and the sand paper 55 fits tightly upon the expanding drum.

The noiseless chain 56 connects the pulley 12 is swung upon the hinge 13 when it is desired to remove or apply the sand paper.

While I have shown the expanding drum upon a machine especially adapted for sand papering floors it is to be understood that the sand pa er drum may be used for other urposes wliere such a drum might be app ied.

The rigid portion of the frame is mounted upon caster wheels 57, and a screw 58 is mounted vertically at the rear end of the machine and has a caster 59, so that by manipulating the screw 58 the pressure of the Tandi paper drum upon the floor may be reguate Various changes may be made without departing from the spirit of my invention as claimed.

I claim:

1. A sand papering machine having a frame, a horizontal shaft mounted in the frame, a tapered core rotatably mounted on the shaft, longitudinal radial tongues on the core, an expanding drum adapted to be removably mounted upon the core, said drum composed of a plurality of arcuate members adapted to be separated by the said longitudinal tongues upon the core, an elastic band encircling the said drum, a cylinder encircling the elastic band, a sheet of sand paper covering the said cylinder and means for removably holding the drum upon the core.

2. A sand papering machine having a. frame, a horizontal shaft mounted in the frame, a tapered core rotatably mounted on said shaft having a ring flange at its larger end extending beyond its periphery and a plurality of radially extending longitudinal tongues on its periphery abutting said flange and terminating a short distance from the opposite end, said tongues being tapered at their last mentioned ends, an expanding drum removably mounted on said core composed of a plurality of arcuate members adapted to be separated by the said tongues, an elastic band encircling the said drum, a cylinder encircling the elastic band, a sheet of sand paper covering cylinder and means for removably holding the drum upon the core.

3. A sand papering machine having a frame, a horizontal shaft mounted in the frame, a tapered core rotatably mounted on said shaft having a ring flange at its larger end extending beyond its periphery and a plurality of radially extending longitudinal tongues on its periphery abutting said flange and termlnating a short distance from the opposite end, said tongues being tapered at their last mentioned ends, an expanding drum removably mounted on said core composed of a. plurality of arcuate members adapted to be separated by the said tongues, a resilient split ring Within said drum adjacent the tapered ends of the tongues, an elastic band encircling the said drum, a cylinder encircling the elastic band, a sheet of sand paper covering the cylinder and means for removably holding the drum upon the core.

4. A sand papering machine comprising a frame, a horizontal shaft mounted in the frame, a core mounted on said shaft having a ring flange at its larger end and extending beyond its periphery, a plurality of radial longitudinally extending tongues on the periphery of the core, an expanding drum adapted to be removably mounted upon the core, said drum consisting of a plurality of arcuate sections adapted to be separated by the said longitudinal tongues, means including a split ring for removably holding the drum upon the core, an elastic band encircling the said drum, and a cylinder of sand paper covering the elastic band.

5. A sand papering machine comprising a frame, a horizontal shaft mounted in the frame, a core mounted on said shaft, a plurality ofradial tongues on the periphery of the core, and expanding drum adapted to be removably mounted upon the core, said drum consisting of a plurality of arcute sections adapted to be separated by the said tongues, an elastic member inclosing said arcuate sections, means including a split ring for removably holding the drum upon the core, and a cylinder of sand paper covering the drum.

6. A sand papering machine comprising a frame, a horizontal shaft in the frame, a tapered core mounted on said shaft having a ring flange at its larger end and extending beyond its periphery; a plurality of radial longitudinally extending tongues on the pe riphery of the core, and expanding drum adapted to be removably mounted upon the core, said drum consisting of a plurality of arcuate sections adapted to be separated by the said longitudinal tongues, an elastic member inclosing said arcuate sections, means including a split ring for removably holding the drum upon the core, and a cylinder of sand paper covering the drum.

In testimony whereof I have signed my name to this specification.

M. L. BEAL. 

